To have someone or something running through your mind, and most likely your loving it.

A Britney Spears song.
Omgz the hawt italian stallions Jonas Brothers have been on my radar all day long!
by BreeeeBatttttt April 8, 2008
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When you're speeding and someone stays behind you at the same pace, in the hopes that -- should a cop be nearby -- you'll get pulled over instead of them.
When I drove home from California, this guy was riding my radar the entire time.
by jukaswo November 6, 2007
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Pretty much a mild flex, basically saying I don’t care about you at all. I haven’t even had a second thought, literally not concerned. Radar picks up everything you not being one of them..
Her- You’re not gonna start problems with my new boyfriend are you?
Me- You must like to stir the pot. That bum isn’t on my radar.
by Anus cream pie October 21, 2023
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